If you file in CA, you will have to use the CA exemptions. Your Oregon property vested in your name alone, and if not acquired during marriage would remain your separate property.
When one files bk one must use the exemptions applicable to the state in which one files subject to certain residency requirements imposed by the bk code to prevent folks from relocating to a state just to take advantage of more generous exemption statutes. If you reside in CA, then presumably you will have to use CA exemptions unless you have not lived there long enough. If you have not lived there long enough, which is basically for the two years prior to filing, then you would either have to use the state exemption for the state in which you resided for the greater part of the two years prior to filing (for a more detailed and accurate statement of the law, consult an attorney) if the state in which you reside restricts their exemptions to residents of that state, you get to use the federal exemptions.
Merely filing bk does not grant your spouse an ownership interest that she would not otherwise have had.
DISCLAIMER: This message is intended as a general discussion of legal issues and not as a statement of fact, legal advice or a legal opinion. No attorney-client relationship is created by this message. Do not act or rely upon law-related information in this communication without seeking the advice of an attorney licensed to practice in the relevant area. I am a Federally Designated Debt Relief Agency under the United States Bankruptcy Code. I proudly help people in financial need file bankruptcy cases. IRS CIRCULAR 230 NOTICE: To ensure compliance with requirements imposed by the IRS, we inform you that any U.S. tax advice contained in this communication (or in any attachment) is not intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or recommending to another party any transaction or matter addressed in this communication (or in any attachment).
You do realize that when you file Ch13 you do not lose any property. If you have considerable equity in the other properties, however, you would have to pay that amount to your unsecured creditors ... but you'd get up to 5 yrs to do it.
I agree with the previous responses and would add that if you file chapter 13 correctly, your properties should not be affected at all. Additionally, you can file individually or jointly with your wife.